Rivermatics

USGS Streamgage 11466320

Santa Rosa C A Willowside Rd near Santa Rosa, CA

Santa Rosa C A Willowside Rd near Santa Rosa, CA is USGS streamgage 11466320 in California, monitoring river discharge in hydrologic subbasin 18010110. It drains a watershed of about 78 square miles. Discharge records at this site go back to 1998. Typical flow runs near 3.3 cfs in July and 33.7 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

Gauge details

State
California
Drainage area
78 sq mi
Gauge elevation
2 ft
Subbasin (HUC-8)
18010110
Coordinates
38.44519, -122.80721
USGS site number
11466320
Records begin
1998-12-09 (28 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Santa Rosa C A Willowside Rd near Santa Rosa, CA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
0.9 1.1 1.3
0.8 1 1.3
0.7 1 1.3
0.7 0.9 1.2
0.7 0.9 1.2
0.6 0.9 1.2
0.6 0.8 1.2
0.5 0.8 1.1
0.5 0.8 1.2
0.5 0.9 1.3
0.6 0.9 1.4
0.5 0.9 1.4
0.5 0.8 1.3
0.5 0.8 1.2

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 28 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 7.6 64.5 698.2
February 13.2 76.4 956
March 14.2 70.7 556.5
April 9.5 33.7 181.5
May 5.7 14.2 52.7
June 2.3 6.5 17.5
July 0.9 3.3 7.8
August 0.6 1.9 5.6
September 0.2 1.5 5.3
October 0.3 2.5 44.8
November 1.2 7.3 105.3
December 3.8 40.7 769.3

All values in cubic feet per second (cfs).

Common questions

When does Santa Rosa C A Willowside Rd near Santa Rosa, CA normally run highest?
February, on the long-term record. The median daily flow that month is about 76.4 cfs, against 1.5 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Santa Rosa C A Willowside Rd near Santa Rosa, CA?
It depends on the month. In January, half of days historically fall near 64.5 cfs, with the middle 80% of days between 7.6 and 698.2 cfs. The month-by-month table on this page gives the full range.
How long has Santa Rosa C A Willowside Rd near Santa Rosa, CA been measured?
Discharge records at USGS site 11466320 begin in 1998, about 28 years, covering roughly 9,130 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Santa Rosa C A Willowside Rd near Santa Rosa, CA?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Santa Rosa C A Willowside Rd near Santa Rosa, CA?
The gauge sits at 38.44519, -122.80721, in California, in hydrologic subbasin 18010110, at an elevation of about 2 feet, draining roughly 78 square miles.
Can I use Santa Rosa C A Willowside Rd near Santa Rosa, CA data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Other gauges in this subbasin